Ash sifting device



Sept. 7,, 1937. J FAKULT 2,092,112

ASH SIFTING DEVICE Filed Nov. 20, 19:55

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ATTORNEY Patented Sept. 7, 1937 PATENT QFFICE UNITED STAT- S ,3 Claims.

This invention relates to an-ash-siftingand unburned-fuel'dischargedevice forcoal stoves, furnaces and heaters-and theash-siftingdevice according to:the invention'is adapted to be disposed in-a furnaceetc. under the grate bars thereof. As well known, ashes passing throughthe now commonly used rotatable or :shiftable grate bars of a furnacecontain a high percentage of unburned fuel, as the grate bars are widelyspaced to permit of-clinkers and other unburnable residue being crushedand discharged into the ash pit of the furnace; Thesifting of ashes inorder to separate the unburned fuel therefrom is very inconvenient,dusty and. unwelcome, therefore furnace operatorsrather waste theunburned fuel than go to the inconvenience-of sifting the ashes.

It is .the primary object of this invention to provide a simple-andelficient ash-sifting and unburned fuel discharge device, whichzisadapted to be disposed and -operated'in 'a furnace so that all .dust anddirt will' be retained in thefurnacaand which is adapted to "forwardlydischarge the sifted unburned ffuel "through i the ash doorof the"furnace into a discharge receptacle, extended .into theafurnaceand-cooperating with "the 'ash sifter during discharge operations.

Another-objectof the invention is to provide an ash sifter of the abovenamed character, which can readily and easily be mounted in a furnaceWithout any change of the stove structure and which is operatedindependently of the grates of the stove.

A further object of the invention is to provide an ash sifter of theabove named character so constructed and mounted in the furnace belowthe grates thereof that all air entering through the ash door contactswith the sifting element and is preheated thereby in order to supplypreheated air to the fire pot and effect a better combustion of thefuel.

With these and incidental objects in view, the invention consists incertain novel features of construction and combination of parts, theessential elements of which are set forth in the appended claims; and apreferred form of embodiment of the invention is hereinafter shown withreference to the drawing accompanying and forming part of thisspecification.

In the drawing Figure 1 is a central vertical section through the lowerpart of a domestic furnace, having an ash sifter according to theinvention mounted therein.

Figure 2 is a top plan view of the reciprocatory ash sifter member ofthe ash sifter shown in gu e 1.

Figure 3 is a perspective view of one of the suspension members of theash sifter.

Figure 4 is a perspective'view of the ash sifter pan and V Figure 5 is aperspective view of the ash sifter 5 discharge receptacle cooperatingwith the ash sifter during discharge operations.

Referring to the drawing the reference numeral 2 designates a stove orfurnace casing, which may be of any desired size, form and material,and, as usual, has in its lower portion. an ash pit 3, equipped with ahorizontally hinged draft controlling door 4. This hinged door is partof a larger door 5, which, as customary, is hinged to the casing '2, soas to swing about a vertical axis l5 and exposea large part of the'ashpit-for cleaning purposes. The casing 2 is provided'with'bearings'fi and1 in which are rotatably mounted grate bars 8, provided at their frontends with extension rods9, which rodsare adapted to be operated by acrank or operating member inserted through an opening in the door 5, allas presently practiced. The furnace casing supports the customarycombustion chamber l0, arranged above the grate bars 8.

In accordance with the present invention an elongated sifting member Iis suspended from the grate bars 8 by means of suspension elements l2.These elements embody a double hookshaped attachment portion 14, adaptedto be hooked to the front or rear ends of 'grate bars 8, as indicated atl5 and I6, and a chain portion I1, I adapted to be hooked into andsecurely interlocked with the perforated bottom wall l8 of member ll,enlarged holes l9 being provided for this purpose. As shown, there arethree suspension elements I 2, which provide a three point suspensionfor the member H and insure a free reciprocatory movement of member llif so desired. The elements l2 are so secured to member 40 II that thetwo front elements l2 and the single rear element l2 converge towardeach other. This arrangement effects a tilting of the member ll towardthe rear, when same is shifted rearwardly and a tilting toward thefront, when member H is shifted toward the front. The element H which ispreferably made of perforated sheet metal or steel, the perforationsbeing indicated at 20 and consisting of holes approximately one 5 eighthof an inch in diameter, is flanged as at 2| at its rear and the twosides. The front portion of the element H is narrowed to approxi matelyone third of the width thereof to provide a narrowed portion 22, whichportion permits of the sifted coal residue being readily discharged, aswill be described hereinafter.

The portion 22 carries at its front end pivoted thereto a threadedoperating member 23 adapted to swing in a horizontal plane, which memberis bent at its outer end to form a loop 24, permitting the connection ofa hook thereto if so desired. The body of member 23 carries nut members25 which are threadedly engaged with said body and longitudinallyadjustable thereon to permit of proper adjustment of the reciprocatorymovement of member I I, as will be later described.

A flat ash pan 2'l seated on the base plate 28 a of the furnace receivesthe ashes which fall through the perforations 2B in member I I duringsifting operations. This pan can readily be removed through the door 5.

During sifting operations the door 5 is in closed position and the door4 is open, so that the member 23 can be extended through the openingcovered by the door 4 for manually reciprocating the member I l duringsuch sifting operations.

When the ashes on the member II have been thoroughly sifted, then adischarge receptacle 29 is inserted into the opening covered by the door4, which receptacle embodies a box-like container 30 open at its frontend and partly open at its This container is provided at its top andspaced from its front end with an angular cross piece 32, rigidlysecured thereto and extending at opposite sides beyond the side walls 33of the container 30. The cross piece 32 limits the inward movement ofthe discharge receptacle into the draft controlling opening covered bythe door 4, furthermore. guides the member 23 during its reciprocatorymovement and finally sto s the forward movement of the member I I duringdischarge operations. Thus the cross piece 32 is provided with avertical narrow slot 34 permitting the member 23 to be extendedtherethrough and to be guided thereby, but limiting the longitudinalmovement of said member and the member II, when the nut members 25 onmember 23 engage the cross piece 32. When the forward movement of themember II is suddenly stopped, then the sifted residue of the ashescontinues to travel on member I l and finally will be discharged intothe container 30, keeping in mind, that the member II at the end of itsforward stroke is forwardly tilted. A handle 35 on container 30 permitsof proper handling of the discharge receptacle 29.

Having thus described my invention, what I claim is:

1. In a furnace having a grate and an ashpit below the grate, an ashsifting and coal residue discharge device comprising a perforatedchutelike sifting member arranged within'the ash-pit of said furnace,converging suspending means for said sifting member adapted to effecttilting of said member when reciprocated, operating means attached tothe front end of said sifting member for manually reciprocating same,and guiding means for said operating means co-operating therewith inlimiting reciprocatory movements of said sifting member,

2. In a furnace having a grate and an ash-pit below the grate, an ashsifting and coal residue discharge device as described in claim 1,wherein the operating means for the sifting member embody means axiallyshiftably secured to said operating means adapted to co-operate withsaid guiding -means in stopping movement of said sifting member in apredetermined position.

3. In an ash sifting and coal residue discharge device for a furnace thecombination of a perforated, flanged sifting member havinga chutelikeextension at its discharge end, means suspending said member forreciprocatory movements, and operating means attached to the extensionof said sifting member for manually shifting'same in oppositedirections, with a coal residue receptacle extended into the furnace be-,low the extension of said sifting member, said receptacle having meansfor guiding the operating means of said sifting member, and means on theoperating'means of said sifting member cooperating with the guidingmeans of said receptacle in stopping the movement of said sifting membertoward said receptacle when said sifting member is in a predeterminedposition to effect discharge of coal residue from said sifting memberthrough its extension into said receptacle.

JOSEPH G. FAKULT.

